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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title></title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="extensions.html" title="Part III.  Extensions" /><link rel="prev" href="extensions.html" title="Part III.  Extensions" /><link rel="next" href="ext_compile_checks.html" title="Chapter 16. Compile Time Checks" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="extensions.html">Prev</a> </td><th width="60%" align="center">Part III. 
  Extensions
  
</th><td width="20%" align="right"> <a accesskey="n" href="ext_compile_checks.html">Next</a></td></tr></table><hr /></div><div class="preface"><div class="titlepage"><div><div><h1 class="title"><a id="manual.ext.preface"></a></h1></div></div></div><p>
  Here we will make an attempt at describing the non-Standard
  extensions to the library.  Some of these are from older versions of
  standard library components, namely SGI's STL, and some of these are
  GNU's.
</p><p><span class="emphasis"><em>Before</em></span> you leap in and use any of these
extensions, be aware of two things:
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>
     Non-Standard means exactly that.
     </p><p>
       The behavior, and the very
       existence, of these extensions may change with little or no
       warning.  (Ideally, the really good ones will appear in the next
       revision of C++.)  Also, other platforms, other compilers, other
       versions of g++ or libstdc++ may not recognize these names, or
       treat them differently, or...
     </p></li><li class="listitem"><p>
       You should know how to access these headers properly.
     </p></li></ol></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="extensions.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="extensions.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ext_compile_checks.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Part III. 
  Extensions
  
 </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 16. Compile Time Checks</td></tr></table></div></body></html>